// Copyright (c) 2016 The Bitcoin Core developers
// Copyright (c) 2017-2019 The Raven Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <event2/event.h>

#ifdef EVENT_SET_MEM_FUNCTIONS_IMPLEMENTED
// It would probably be ideal to define dummy test(s) that report skipped, but boost::test doesn't seem to make that practical (at least not in versions available with common distros)

#include <map>
#include <stdlib.h>

#include "support/events.h"

#include "test/test_raven.h"

#include <vector>

#include <boost/test/unit_test.hpp>

static std::map<void *, short> tags;
static std::map<void *, uint16_t> orders;
static uint16_t tagSequence = 0;

static void *tag_malloc(size_t sz)
{
    void *mem = malloc(sz);
    if (!mem) return mem;
    tags[mem]++;
    orders[mem] = tagSequence++;
    return mem;
}

static void tag_free(void *mem)
{
    tags[mem]--;
    orders[mem] = tagSequence++;
    free(mem);
}

BOOST_FIXTURE_TEST_SUITE(raii_event_tests, BasicTestingSetup)

    BOOST_AUTO_TEST_CASE(raii_event_creation_test)
    {
        BOOST_TEST_MESSAGE("Running Raii Even Creation Test");

        event_set_mem_functions(tag_malloc, realloc, tag_free);

        void *base_ptr = nullptr;
        {
            auto base = obtain_event_base();
            base_ptr = (void *) base.get();
            BOOST_CHECK(tags[base_ptr] == 1);
        }
        BOOST_CHECK(tags[base_ptr] == 0);

        void *event_ptr = nullptr;
        {
            auto base = obtain_event_base();
            auto event = obtain_event(base.get(), -1, 0, nullptr, nullptr);

            base_ptr = (void *) base.get();
            event_ptr = (void *) event.get();

            BOOST_CHECK(tags[base_ptr] == 1);
            BOOST_CHECK(tags[event_ptr] == 1);
        }
        BOOST_CHECK(tags[base_ptr] == 0);
        BOOST_CHECK(tags[event_ptr] == 0);

        event_set_mem_functions(malloc, realloc, free);
    }

    BOOST_AUTO_TEST_CASE(raii_event_order_test)
    {
        BOOST_TEST_MESSAGE("Running Raii Even Order Test");

        event_set_mem_functions(tag_malloc, realloc, tag_free);

        void *base_ptr = nullptr;
        void *event_ptr = nullptr;
        {
            auto base = obtain_event_base();
            auto event = obtain_event(base.get(), -1, 0, nullptr, nullptr);

            base_ptr = (void *) base.get();
            event_ptr = (void *) event.get();

            // base should have allocated before event
            BOOST_CHECK(orders[base_ptr] < orders[event_ptr]);
        }
        // base should be freed after event
        BOOST_CHECK(orders[base_ptr] > orders[event_ptr]);

        event_set_mem_functions(malloc, realloc, free);
    }

BOOST_AUTO_TEST_SUITE_END()

#endif  // EVENT_SET_MEM_FUNCTIONS_IMPLEMENTED
